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Cosmic microwave background dipole spectrum measured by the COBE FIRAS instrument
Fixsen, D. J.; Cheng, E. S.; Cottingham, D. A.; Eplee, R. E., Jr.; Isaacman, R. B.; Mather, J. C.; Meyer, S. S.; Noerdlinger, P. D.; Shafer, R. A.; Weiss, R.; Wright, E. L.; Bennett, C. L.; Boggess, N. W.; Kelsall, T.; Moseley, S. H.; Silverberg, R. F.; Smoot, G. F.; Wilkinson, D. T.
AA(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AB(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AC(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AD(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AE(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AF(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AG(MIT, Cambridge, MA, US), AH(MIT, Cambridge, MA, US), AI(NASA. Goddard Space Flight Center, Greenbelt, MD, US), AJ(NASA. Goddard Space Flight Center, Greenbelt, MD, US)
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 420, no. 2, p. 445-449 (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Background Radiation, Cosmic Rays, Dipole Moments, Far Infrared Radiation, Microwave Spectra, Background Noise, Cosmic Background Explorer Satellite, Doppler Effect, Michelson Interferometers, Monopoles, Plancks Constant, Signal To Noise Ratios, Spectral Resolution
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The Far-Infrared Absolute Spectrophotometer (FIRAS) instrument on the Cosmic Background Explorer (COBE) has determined the dipole spectrum of the cosmic microwave background radiation (CMBR) from 2 to 20/cm. For each frequency the signal is decomposed by fitting to a monopole, a dipole, and a Galactic template for approximately 60% of the sky. The overall dipole spectrum fits the derivative of a Planck function with an amplitude of 3.343 +/- 0.016 mK (95% confidence level), a temperature of 2.714 +/- 0.022 K (95% confidence level), and an rms deviation of 6 x 10-9 ergs/sq cm/s/sr cm limited by a detector and cosmic-ray noise. The monopole temperature is consistent with that determined by direct measurement in the accompanying article by Mather et al.

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